<!DOCTYPE html>
<html>
<head lang="en">
    <meta charset="UTF-8">
    <title>task29</title>
    <link rel="stylesheet" href="style.css" type="text/css">
</head>
<body>
    <div class="myDiv">
        <label><b>名称</b><input type="text" class="myText"><input type="button" value="验证" class="myBtn"></br><span class="mySpan">必填，长度为4~16个字符</span></label>
    </div>

</body>
<script src="task29.js">

</script>
</html>